The problem seems to be related to installation of the Dropbox client. If you use Dropbox via the web only, you don't need to read further - you should be fine. But if you have installed the client, you need to make sure that the local Dropbox folder is located on your C:\ drive and not in your My Documents. As we all know, anything on your C drive is not included in the sync process. (So any files you create there need to be backed up by you manually!)
Here are the steps for viewing and changing (if necessary) the location of your local Dropbox folder:
- Right-click on the Dropbox icon in your system tray (lower right)
- Choose "Preferences" from the menu
- Click on the "Advanced" tab and make sure your folder location doesn't start with C:\users\yourprofilename:
- Click the Move button if you need to move the folder. A new folder named "Dropbox" will be created in the folder you select, and all your existing content will be moved to the new location.